System.IO.FileStreamHelpers.GetFileOpenFunction C# (CSharp) Méthode

        private static FileOpenDelegate GetFileOpenFunction()
        {
            Type fileSystemType = Type.GetType("System.IO.File, System.IO.FileSystem, Version=4.0.1.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a", throwOnError: false);
            var methodInfos = fileSystemType?.GetTypeInfo().GetDeclaredMethods("Open");
            if (methodInfos != null)
            {
                foreach (MethodInfo methodInfo in methodInfos)
                {
                    var methodParams = methodInfo.GetParameters();
                    if (methodParams?.Length == 4 &&
                        methodParams[0].Name == "path" &&
                        methodParams[1].Name == "mode" &&
                        methodParams[2].Name == "access" &&
                        methodParams[3].Name == "share")
                    {
                        return (FileOpenDelegate)methodInfo.CreateDelegate(typeof(FileOpenDelegate));
                    }
                }
            }
            Debug.Fail("Could not access the File.Open function via reflection into System.IO.FileSystem version 4.0.1.0.");
            return null;
        }
    }